April 26, 201313 yr Standard plug is NGK cr6...something, is there an Iridium plug that crosses over? I've had really good luck with Iridium plugs in other 4t dirt bikes.
April 26, 201313 yr Go on the NGK website and put in the bike details and it will show if there is an iridium equivalent available.
June 28, 201313 yr CR6EH-9 plug ot the 4RT is also common on a lot of other engines. Irridium equivalent would be: CR6EIX-9 or CR6EIA-9 ($8.89 + free shipping at Amazon.com http://www.amazon.com/NGK-CR6EIA-9-Iridium-Spark-Plug/dp/B001RLOE8U) Some of the quad guys go one heat range hotter: CR7EIX-9, they claim better idle, starting, and running. Snow machines are also using this plug.
June 28, 201313 yr My trial shop advised me to use the standard CR6EH-9 in the summer and when it's below 10°C to use the CR5EH-9. And my 4RT starts and runs always fine. I would not use the CR7EIX-9, unless it's very hot or you are riding a lot at high speeds...A trials bike is no quad...
June 29, 201313 yr You should try the E3 plug, I'm convinced that it has prevented some of the stalls I used to have. I actually had the engine momentarily stall and restart, like a 2 stroke will do. I didn't think that was possible with a 4 stroke, but it happened twice since using the E3 plug. The 4RT uses the E3.38 plug. I've had the same plug for 2 years now. Cheaper too...
August 29, 201312 yr You should try the E3 plug, I'm convinced that it has prevented some of the stalls I used to have. I actually had the engine momentarily stall and restart, like a 2 stroke will do. I didn't think that was possible with a 4 stroke, but it happened twice since using the E3 plug. The 4RT uses the E3.38 plug. I've had the same plug for 2 years now. Cheaper too... I just pick up an E3 to give it a shot. Do you know what gap you are running?
August 30, 201312 yr My son and I have used the E3 plug in our 4RT's for several years without any issue. I have the same plug installed for over 2 years now...
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